Galatians 5:7-9

Amplified Bible

⁷ You were running [the race] well; who has interfered and prevented you from obeying the truth? ⁸ This [deceptive] persuasion is not from Him who called you [to freedom in Christ]. ⁹ A little ^[a]leaven [a slight inclination to error, or a few false teachers] leavens the whole batch [it perverts the concept of faith and misleads the church].